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    <title>homework4</title>
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    <pre>
        from time import sleep
        class Person:
            def __init__(self, name, age):
                self.name = name
                self.age = age
            def speak(self):
                print("我是%s, 今年%s岁." % (self.name, self.age))
                
        class Student(Person):
            def __init__(self, name, age, school, id):
                super(Student, self).__init__(name, age)
                self.school = school
                self.my_id = id
            def speak(self):
                print("我是%s,今年%s岁,来自%s,学号%d." % (self.name, self.age, self.school, self.my_id))
            def run(self, v, times):
                return v*times

        class CollegeStudent(Student):
            def __init__(self, name, age, school, id, language):
                super(CollegeStudent, self).__init__(name, age, school, id)
                self.language = language
            def speak(self):
                print("我是%s,今年%s岁,来自%s,学号%d,我会%s." % (self.name, self.age, self.school, self.my_id, self.language))
            def coding(self):
                print("I am coding", end=" ")
                for i in range(10):
                    print(".", end=" ")
                    sleep(1)

        x = CollegeStudent('Torrence', '20', 'xaut', 23333, 'python')
        x.speak()
        x.coding()
    </pre>
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